We have measured the resonant Auger spectra of four simple organic molecules containing a carbony... more We have measured the resonant Auger spectra of four simple organic molecules containing a carbonyl (C@O) group, following excitation of an oxygen 1s electron to an antibonding valence orbital. The full range of final state energies is presented. The spectra are analysed for similarities arising from similar chemical structures within the molecules. An ab initio calculation of the resonant Auger spectrum of the simplest molecule, formic acid, is shown to aid in the interpretation.
Experiments were conducted to asymmetrically fuse protoplasts from sweet potato (Ipomoea batatas ... more Experiments were conducted to asymmetrically fuse protoplasts from sweet potato (Ipomoea batatas L. Lam.) and its wild relativesI. trifida Don. andI. lacunosa L. Protoplasts of sweet potato were treated with iodoacetamide, whereas those ofI. trifida Don. andI. lacunosa L. were irradiated with X-rays. The asymmetric protoplast fusion was carried out by the electrofusion method and by polyethylene glycol treatment. Electrically-fused protoplasts initiated cell division, and then formed calli earlier than the polyethylene glycol-fused protoplasts. Plant regeneration occurred only in electrofused calli, suggesting that polyethylene glycol had some toxic effect on plant regeneration ability. Analysis of peroxidase isozymes confirmed the interspecific hybrid characteristics of both the fusion-derived calli and regenerated plants.
Purpose: To describe a new drilling system that allows the surgeon to obtain autologous living bo... more Purpose: To describe a new drilling system that allows the surgeon to obtain autologous living bone that, when associated with a plasma rich in growth factors (PRGF), can be used in bone grafting. Materials and Methods: Bone particles collected using both conventional and new drilling systems were analyzed by means of optic and electronic microscopy in 10 patients. Blood was collected from 43 volunteers and used to prepare PRGF. Quantitative aspects of the PRGF, including number of platelets and concentration of growth factors (insulin growth factor [IGF-I], transforming growth factor [TGF-1], platelet-derived growth factor [PDGF-AB], vascular endothelial growth factor [VEGF], hepatocyte growth factor [HGF], and epidermal growth factor [EGF]) were assessed. A demonstrative case study was presented. Results: Microscopic examination showed that the bone structure and the presence of living cells in the bone chips were conserved in all samples obtained from drilling at low speed, whereas material obtained by conventional drilling did not maintain these qualities. Mean counts for TGF-1 (55.27 ± 16.23 ng/mL), PDGF-AB (27.96 ± 12.13 ng/mL), VEGF (421.09 ± 399.0 pg/mL), EGF (455.49 ± 210.04 pg/mL), and HGF (605.70 ± 269.20 pg/mL) were significantly correlated with the number of platelets (590,000 ± 197,000 platelets/μL; P < .05). Discussion and Conclusion: The new drilling procedure was developed based on biologic criteria. The method may reduce damage to the host tissue and can be used to obtain a mass of living bone for subsequent grafting in association with autologous growth factors. This new procedure may present new possibilities for enhanced bone healing and needs to be evaluated in a clinical trial. (Technical Note) INT J ORAL MAX-ILLOFAC IMPLANTS 2007;22:138-145
... Mysak, and Cindy Samet*. Department of Chemistry, Dickinson College, Carlisle, Pennsylvania 1... more ... Mysak, and Cindy Samet*. Department of Chemistry, Dickinson College, Carlisle, Pennsylvania 17013. Andy Maynard. Laboratory of Experimental and Computational Biology, IRSP, SAIC−Frederick, National Cancer Institute−FCRDC, Frederick, Maryland 21702. J. Phys. Chem. ...
The local structures of Zn1−xMgxO alloys have been studied by Raman spectroscopy and by synchrotr... more The local structures of Zn1−xMgxO alloys have been studied by Raman spectroscopy and by synchrotron x-ray pair distribution function (PDF) analysis. Within the solid solution range (0 ≤ x ≤ 0.15) of Zn1−xMgxO, the wurtzite framework is maintained with Mg homogeneously distributed throughout the wurtzite lattice. The E high 2 Raman line of Zn1−xMgxO displays systematic changes in response to the evolution of the crystal lattice upon the Mg-substitution. The red-shift and broadening of the E high 2 mode are explained by the expansion of hexagonal ab-dimensions, and compositional disorder of Zn/Mg, respectively. Synchrotron x-ray PDF analyses of Zn1−xMgxO reveal that the Mg atoms have a slightly reduced wurtzite parameter u and more regular tetrahedral bond distances than the Zn atoms. For both Zn and Mg, the internal tetrahedral geometries are independent of the alloy composition.
Using list-assisted random digit dialing (RDD) with telephone data collection and address-based s... more Using list-assisted random digit dialing (RDD) with telephone data collection and address-based sampling (ABS) with mail questionnaires are two survey designs that yield probability based inference, yet they are so different that they can yield entirely different results. The 2007 Health Information National Trends Survey (HINTS) provides a unique opportunity to evaluate the effect of these different designs on a variety of survey estimates and, even more importantly, the effect on individual sources of survey error. Understanding the difference in error structure between the two designs is important to survey practitioners in order to select the optimum design, and to data users who can anticipate which results may be affected and how. We first compared estimates between the two designs and then estimated the different sources of error. In addition to identified differences in estimates, we found that for some estimates the two designs can yield similar results merely due to the effect of similar biases. The error components were quite different between the two designs––while the ABS design yields almost complete coverage of the population compared to the RDD design, it was subjected to substantially higher nonresponse bias.
With the promised benefits for outsourcing IT security services also come major risks. IT securit... more With the promised benefits for outsourcing IT security services also come major risks. IT security outsourcing decisions possess major legal, organizational and contractual risks. Drawing on National Institute of Standards and Technology (NIST) publications as the principal source of information, supplemented by interviews with key security personnel, this research reviewed and extracted IT security risk elements which culminated in a
The Real-Time Specification for Java (RTSJ) provides a platform for the development of real-time ... more The Real-Time Specification for Java (RTSJ) provides a platform for the development of real-time applications. However, the RTSJ does not take the distribution requirements of real-time applications into consideration. As distribution in Java is often implemented using Java's Remote Method Invocation (RMI), a real-time version of RMI between RTSJ implementations can provide a platform for writing distributed real-time systems.
The carbon cycles in the ocean have great influence on the atmospheric CO2 concentration (pCO2, h... more The carbon cycles in the ocean have great influence on the atmospheric CO2 concentration (pCO2, hereafter) because the deep ocean is a much larger reservoir of CO2 compared to the atmosphere-surface ocean system. CO2 in the surface ocean is transported by physical and biological ways to the deep ocean to make a contrast in carbon concentration between the surface ocean and the deep ocean, resulting in lowering pCO2. The global thermohaline circulation (THC) of ocean would have influence both on the physical and biological transport of CO2. It is very important to assess adequately the effect of changes of the global THC on pCO2. We tackle this issue using an ocean general circulation model (OGCM) coupled with a biogeochemical model. This study is important for the better understanding of natural variability of pCO2 as well as the glacial-interglacial cycles. Concerning this problem, we have investigated the effect of various changes in physical conditions of ocean including the circulation field on pCO2 by various numerical experiments. We assumed five model- ocean circulation fields which are based on reproduction by an atmosphere-ocean coupled general circulation model (MIROC3.2). We found that the effect of the difference in the circulation field on pCO2 was very small in every case. For example, if a last-glacial-maximum physical ocean field reproduced by MIROC3.2 was assumed, pCO2 was lowered by ~30 ppm compared to the interglacial value. Most of the 30 ppm reduction can be explained by higher solubility of CO2 into the ocean due to the glacial lower sea-surface temperature. On the other hand, the effect of change in the circulation was less than several ppm. This would be because the variation in physical CO2 transport to the deep ocean and biological counterpart induced by the circulation change would offset each other. The similar characteristic was observed for each of the circulation fields.
We have measured the resonant Auger spectra of four simple organic molecules containing a carbony... more We have measured the resonant Auger spectra of four simple organic molecules containing a carbonyl (C@O) group, following excitation of an oxygen 1s electron to an antibonding valence orbital. The full range of final state energies is presented. The spectra are analysed for similarities arising from similar chemical structures within the molecules. An ab initio calculation of the resonant Auger spectrum of the simplest molecule, formic acid, is shown to aid in the interpretation.
Experiments were conducted to asymmetrically fuse protoplasts from sweet potato (Ipomoea batatas ... more Experiments were conducted to asymmetrically fuse protoplasts from sweet potato (Ipomoea batatas L. Lam.) and its wild relativesI. trifida Don. andI. lacunosa L. Protoplasts of sweet potato were treated with iodoacetamide, whereas those ofI. trifida Don. andI. lacunosa L. were irradiated with X-rays. The asymmetric protoplast fusion was carried out by the electrofusion method and by polyethylene glycol treatment. Electrically-fused protoplasts initiated cell division, and then formed calli earlier than the polyethylene glycol-fused protoplasts. Plant regeneration occurred only in electrofused calli, suggesting that polyethylene glycol had some toxic effect on plant regeneration ability. Analysis of peroxidase isozymes confirmed the interspecific hybrid characteristics of both the fusion-derived calli and regenerated plants.
Purpose: To describe a new drilling system that allows the surgeon to obtain autologous living bo... more Purpose: To describe a new drilling system that allows the surgeon to obtain autologous living bone that, when associated with a plasma rich in growth factors (PRGF), can be used in bone grafting. Materials and Methods: Bone particles collected using both conventional and new drilling systems were analyzed by means of optic and electronic microscopy in 10 patients. Blood was collected from 43 volunteers and used to prepare PRGF. Quantitative aspects of the PRGF, including number of platelets and concentration of growth factors (insulin growth factor [IGF-I], transforming growth factor [TGF-1], platelet-derived growth factor [PDGF-AB], vascular endothelial growth factor [VEGF], hepatocyte growth factor [HGF], and epidermal growth factor [EGF]) were assessed. A demonstrative case study was presented. Results: Microscopic examination showed that the bone structure and the presence of living cells in the bone chips were conserved in all samples obtained from drilling at low speed, whereas material obtained by conventional drilling did not maintain these qualities. Mean counts for TGF-1 (55.27 ± 16.23 ng/mL), PDGF-AB (27.96 ± 12.13 ng/mL), VEGF (421.09 ± 399.0 pg/mL), EGF (455.49 ± 210.04 pg/mL), and HGF (605.70 ± 269.20 pg/mL) were significantly correlated with the number of platelets (590,000 ± 197,000 platelets/μL; P < .05). Discussion and Conclusion: The new drilling procedure was developed based on biologic criteria. The method may reduce damage to the host tissue and can be used to obtain a mass of living bone for subsequent grafting in association with autologous growth factors. This new procedure may present new possibilities for enhanced bone healing and needs to be evaluated in a clinical trial. (Technical Note) INT J ORAL MAX-ILLOFAC IMPLANTS 2007;22:138-145
... Mysak, and Cindy Samet*. Department of Chemistry, Dickinson College, Carlisle, Pennsylvania 1... more ... Mysak, and Cindy Samet*. Department of Chemistry, Dickinson College, Carlisle, Pennsylvania 17013. Andy Maynard. Laboratory of Experimental and Computational Biology, IRSP, SAIC−Frederick, National Cancer Institute−FCRDC, Frederick, Maryland 21702. J. Phys. Chem. ...
The local structures of Zn1−xMgxO alloys have been studied by Raman spectroscopy and by synchrotr... more The local structures of Zn1−xMgxO alloys have been studied by Raman spectroscopy and by synchrotron x-ray pair distribution function (PDF) analysis. Within the solid solution range (0 ≤ x ≤ 0.15) of Zn1−xMgxO, the wurtzite framework is maintained with Mg homogeneously distributed throughout the wurtzite lattice. The E high 2 Raman line of Zn1−xMgxO displays systematic changes in response to the evolution of the crystal lattice upon the Mg-substitution. The red-shift and broadening of the E high 2 mode are explained by the expansion of hexagonal ab-dimensions, and compositional disorder of Zn/Mg, respectively. Synchrotron x-ray PDF analyses of Zn1−xMgxO reveal that the Mg atoms have a slightly reduced wurtzite parameter u and more regular tetrahedral bond distances than the Zn atoms. For both Zn and Mg, the internal tetrahedral geometries are independent of the alloy composition.
Using list-assisted random digit dialing (RDD) with telephone data collection and address-based s... more Using list-assisted random digit dialing (RDD) with telephone data collection and address-based sampling (ABS) with mail questionnaires are two survey designs that yield probability based inference, yet they are so different that they can yield entirely different results. The 2007 Health Information National Trends Survey (HINTS) provides a unique opportunity to evaluate the effect of these different designs on a variety of survey estimates and, even more importantly, the effect on individual sources of survey error. Understanding the difference in error structure between the two designs is important to survey practitioners in order to select the optimum design, and to data users who can anticipate which results may be affected and how. We first compared estimates between the two designs and then estimated the different sources of error. In addition to identified differences in estimates, we found that for some estimates the two designs can yield similar results merely due to the effect of similar biases. The error components were quite different between the two designs––while the ABS design yields almost complete coverage of the population compared to the RDD design, it was subjected to substantially higher nonresponse bias.
With the promised benefits for outsourcing IT security services also come major risks. IT securit... more With the promised benefits for outsourcing IT security services also come major risks. IT security outsourcing decisions possess major legal, organizational and contractual risks. Drawing on National Institute of Standards and Technology (NIST) publications as the principal source of information, supplemented by interviews with key security personnel, this research reviewed and extracted IT security risk elements which culminated in a
The Real-Time Specification for Java (RTSJ) provides a platform for the development of real-time ... more The Real-Time Specification for Java (RTSJ) provides a platform for the development of real-time applications. However, the RTSJ does not take the distribution requirements of real-time applications into consideration. As distribution in Java is often implemented using Java's Remote Method Invocation (RMI), a real-time version of RMI between RTSJ implementations can provide a platform for writing distributed real-time systems.
The carbon cycles in the ocean have great influence on the atmospheric CO2 concentration (pCO2, h... more The carbon cycles in the ocean have great influence on the atmospheric CO2 concentration (pCO2, hereafter) because the deep ocean is a much larger reservoir of CO2 compared to the atmosphere-surface ocean system. CO2 in the surface ocean is transported by physical and biological ways to the deep ocean to make a contrast in carbon concentration between the surface ocean and the deep ocean, resulting in lowering pCO2. The global thermohaline circulation (THC) of ocean would have influence both on the physical and biological transport of CO2. It is very important to assess adequately the effect of changes of the global THC on pCO2. We tackle this issue using an ocean general circulation model (OGCM) coupled with a biogeochemical model. This study is important for the better understanding of natural variability of pCO2 as well as the glacial-interglacial cycles. Concerning this problem, we have investigated the effect of various changes in physical conditions of ocean including the circulation field on pCO2 by various numerical experiments. We assumed five model- ocean circulation fields which are based on reproduction by an atmosphere-ocean coupled general circulation model (MIROC3.2). We found that the effect of the difference in the circulation field on pCO2 was very small in every case. For example, if a last-glacial-maximum physical ocean field reproduced by MIROC3.2 was assumed, pCO2 was lowered by ~30 ppm compared to the interglacial value. Most of the 30 ppm reduction can be explained by higher solubility of CO2 into the ocean due to the glacial lower sea-surface temperature. On the other hand, the effect of change in the circulation was less than several ppm. This would be because the variation in physical CO2 transport to the deep ocean and biological counterpart induced by the circulation change would offset each other. The similar characteristic was observed for each of the circulation fields.
Uploads
Papers by Andi AB